PRESS RELEASE DETAIL


Dec 21, 2007

Conference Call to Discuss Q3 2005 Results and the Company's Financial Outlook

2005-10-05 2005 Conference Call to Discuss Q3 2005 Results and the Company's Financial Outlook

Hosted by Andrew C. Florance, President & Chief Exe...

2005-10-05 2005 Conference Call to Discuss Q3 2005 Results and the Company's Financial Outlook

Hosted by Andrew C. Florance, President & Chief Executive Officer and Frank A. Carchedi, Chief Financial Officer

BETHESDA, MD -- The following is being issued by CoStar Group, Inc. (NASDAQ: CSGP):

PRESS RELEASE:
After the Market Close, Wednesday, Oct. 19, 2005

CONFERENCE CALL:
Thursday, Oct. 20, 2005
11:00 A.M. (EDT)

U.S. Dial-In Number: (800) 329-4405
International Dial-In Number: (706) 634-0964


Live Web broadcast can be found at:
http://www.costar.com/corporate/investor/

CONFERENCE CALL REPLAY:
U.S. Dial-In Number: (800) 642-1687
International Dial-In Number: (706) 645-9291
Conference ID: 9301713


A telephonic replay of the conference call will be available two hours after the live call concludes through midnight on Oct. 27, 2005. The replay will also be available over the Internet at http://www.costar.com/corporate/investor for a period of time following the call.

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